Molder s jointless plate



(No Model.)

W. S. WITHERS.

MOLDERS JOINTLESS PLATE.

Patented June 19,1883.

3 Sheets-Sheet 1.

N. PETERS. Fhawulhn n mn Washingmn, n. c.

(No Model.) 3 Sheets-Sheet 2.

W. s. WIT HE RS. MOLDERS JOINTLESS PLATE. No. 279,627. Patented June19,1883.

(No Model.)'

3 Sheets- Sheet 3. W. S. WITHERS. QLDERS ,JOINTLESS PLATE.

Patented June 19,1883. FM

N. PETERS. PlwhrLilhognphur, Wamhingtan, D. c.

UNITED STATES PATENT OFF CE.

\VALTER S. \VITHERS, OF ATLANTA, GEORGIA.

MOLDERS JOINTLESS PLATE.

SPECIFICATION forming part of Letters Patent No. 279,627, dated June 19,1883.

Application filed February 27, 1883. (No model.)

T 0 all whom it may concern Be it known that I, WALTER S. WrrHERs, acitizen of the United States, residing at Atlanta, in the county ofFulton and State of Georgia, lfd ve invented certain new and usefulImprovements in Molders Jointless Plates; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to improvements in the process of molding, improvedapparatus for that purpose, and the method of obtaining the same.

The object of my invention is to facilitate the operation of casting byimproving the means for producing the matrix in two-part molding.

I11 the ordinary method skilled labor, great care, and a consequentamount of time are required to produce a perfect mold from a pattern ofsimplest kind; but by the employment of my invention the matrix may berapidly and more correctlyobtained. To secure the results I employ whatI term a jointless plate, in combination with either the originalpattern or one similar thereto, of metal.

My invention consists of a jointless plate having on its complementarysides a bas-relief and an intaglio representation of one side or portiononly of the pattern above and below what is commonly known as thepartingline, and in the process of obtaining the said jointless plate.

It further consists in the combination, for the purpose of molding, ofthe pattern united with the said jointless plate in the mannerhereinafter stated, and in certain features of construction morespecifically pointed out in the claim.

In the accompanying drawings, in which similar letters of referenceindicate corresponding parts in each of the several figures, Figure 1 isa plan view of the jointless plate on the has-relief side. Fig. 2 is aplan view of the reverse or intaglio side of the same. Figs. 3 and 3 arevertical transverse sectional views of the same on the line :10 a, Fig.1, combined with the pattern and an ordinary two-part flask in reversedpositions, the cope and drag having been duly filled with molding-sandand rammed in the usual manner. Figs. 4 and 4 are vertical transversesections of the flask in reversed positions after the jointless .plateand pattern have been removed from between the cope and drag, the matrixbeing ready for pouring when the flask is in the position represented byFig. 4. verse sectional viewof the jointless plate cut at line 00 at,Fig. 1. Fig. 6 is a detail transverse sectional view of a pattern. Fig.7 is a side elevation of the pattern.

-A A represent, respectively, the two parts cope and drag-of aflask'constructed in the usual manner for molding purposes, having allnecessary guide-pins and lugs; B, the central portion of j ointlessplate, composed of any suitable and easily-fusible metal, which iscombined with an iron rim or frame, B, constructcd of three layers ofsheet metal secured together by rivets or screws. The middle 1. yer ofthe rim or frame B extends beyond the in nor edges of the others, asindicated in Figs. 1 and 2, and is supplied with perforations a, aspartially shown in said figures, where cen tral portion, B, is cut away,and by means of these perforations the central portion, B, is securelyriveted to the said rim or frame B. This rim or frame B is furnishedwith guide Fig. 5 is a detail transholes I) I), which serve to steadythe jointless plate B B whenused in connection with a flask for molding.

0 represents the pattern, any form or design.

D D represent the molding-sand inclosed by the sides of flask, which isemployed to form the matrix M. (See Figs. 4 and 4.)

My method of obtaining the jointless plate B B is as follows: Theoriginal pattern, or a casting used as such, is molded to thepartingline in the drag of a common two-part flask; but plaster-of-parisis used instead of sand. The drag is then upturned, after the p1aster-'of-paris has become hard, the pattern removed from the mold, and thecope placed-in position on the drag and filled with sand and rammed. Ihave thus obtainedv in one part of the flask a has-relief of onev sideor part of the pattern and in the other an intaglio impression of thewhich may be of same, as will be readily understood. The rim or frame B,previously constructed as before stated, is now placed between the copeand drag of the flask, which it fits accurately, and into the hollowspace thus formed between the molds in the cope and drag is poured anyeasilyfusible and suitable metal, and the edges of this casting becomejoined with the rim or frame B by means of middle projecting layer andperforation therein. \Vhen the rim or frame B, together with the centralportion, B, of soft metal, joined thereto, is removed from the flask, aperfect jointless plate, B B, is pro duced, bearing on its complementarysides a basrelief and an intaglio representation of one side or portionof the pattern above and below the parting-line.

To facilitate future operations, models of the runner or gate g, forpouring, together with a hole, for supporting a gateplug, are formed inthe jointless plate when it is cast as represented in Fig. 1.

To make castings by means of my combined invention, the jointless plateB B is placed in position between the cope and drag and the flaskinverted, thus bringing the intaglio face of the jointless plateuppermost. The pattern is then installed in ,its place in said intaglioface and the drag filled with moldingsand D and rammed in the usualmanner. The flask is now restored to its normal position, which bringsthe bas-relief face of the jointless plate again uppermost, and the copeis filled and rammed in like manner to the drag with the molding-sand D,Figs. 3 and 3. All the parts are now in the relative locationrepresented by the sectional view presented in Fig. 3. It will bereadily understood, therefore, that after the cope A is lifted off, thejointless plate B B removed from the drag A, and the pattern 0 drawnfrom the moldtherein, a matrix, M, will exist within the flask after thecope A has been replaced 011 the drag A, and the work be complete andready for pouring to make the casting, as represented in section by Fig.4.

In preparing molds for casting by the ordinary method a skillful hand isneeded to draw the pattern, and more or less wetting and tap ping arenecessary to effect a good result; but the accuracy of the mold is tosome degree thereby impaired. By the use of my invention the entireoperation may be performed not only more rapidly, but by unskilledlabor,for reasons which will. be manifest to those familiar with the art, anda consequent saving of time and expense is the result.

Should the jointless plate B B, without the pattern being installed inplace on its intaglio face, be used in the operation of molding, afterthe plate was removed the flask would then contain no matrix, for thecope A would simply present a perfect negative of the mold formed in thedrag A. The rim or frame B, being made to conform to the shape of theflask to which it is fitted, can be used again and again in connectionwith said flask after the pattern represented 011 central part, B, hasbecome useless, inasmuch as said part B can be separated therefrom and anew one united therewith in asimilar manner to the first, thus greatlydiminishing the number of rims or frames that would otherwise berequired.

In consequence of the peculiar construction of my jointless plate B B,it is easily handled, and any design, either ornamental or plain, formolding in metal, paper, terracotta, .or other material, may be producedthereon and thereby for machinery or other purposes, and.

be preserved without the cumulation of heavy and cumbersome materialbeing incurred.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A jointless plate for molding purposes, bearing on its complementaryfaces or sides basrelief and intaglio representations of part or oneside of the pattern above and below the partingl.ine, in combinationwith a rim or frame, to which it is east in a separable manner, said rimor frame being composed of metal, substantially as shown and described,and provided with an inner projecting edge having perforations, for thepurpose hereinbefore set forth. In testimony whereof I have affixed mynature in presence of two witnesses. XVALTER S. \VITHERS.

\Vitnesses:

O. C. HILL, DANIEL PITOHFORD.

